"Sonar Legs emit powerful sonar waves that are designed to eliminate the fog-of-war. Unlike Recon Legs, Combots outfitted with Sonar Legs are able to reveal the Underground topography if they are located on the Surface layer. The Sonar Legs will also expose some of the Surface layer, although they are nowhere near as good as Recon Legs. Furthermore, Sonar Legs have a relatively weak defensive capability making them extremely vulnerable to enemy attack."